The use of thermometres by someone whom you have not engaged, a stranger, is an affront, an invasive abuse of your person and your privacy. I only had it done to me once, when I was taken unaware. This happened at my regular pharmacy. Fortunately, there are two pharmacies in town, so I changed my custom.
I don't know if there is any risk in using them.
Fortunately where I live there there is markedly less of the unpleasant and strange insane practices that I read about here on CathInfo, such as mask wearing. I have never seen anyone wearing a mask in my town.